Make some inner classes static

Closes #7370

src/org/thoughtcrime/securesms/components/AudioView.java

@@ -316,7 +316,7 @@ public class AudioView extends FrameLayout implements AudioSlidePlayer.Listener
     }
   }
 
-  private class TouchIgnoringListener implements OnTouchListener {
+  private static class TouchIgnoringListener implements OnTouchListener {
     @Override
     public boolean onTouch(View v, MotionEvent event) {
       return true;

src/org/thoughtcrime/securesms/components/emoji/parsing/EmojiParser.java

@@ -85,7 +85,7 @@ public class EmojiParser {
     return best;
   }
 
-  public class Candidate {
+  public static class Candidate {
 
     private final int           startIndex;
     private final int           endIndex;
@@ -110,7 +110,7 @@ public class EmojiParser {
     }
   }
 
-  public class CandidateList implements Iterable<Candidate> {
+  public static class CandidateList implements Iterable<Candidate> {
     public final List<EmojiParser.Candidate> list;
     public final boolean                     allEmojis;
 

src/org/thoughtcrime/securesms/scribbles/StickerSelectActivity.java

@@ -82,7 +82,7 @@ public class StickerSelectActivity extends FragmentActivity implements StickerSe
     finish();
   }
 
-  class StickerPagerAdapter extends FragmentStatePagerAdapter {
+  static class StickerPagerAdapter extends FragmentStatePagerAdapter {
 
     private final Fragment[] fragments;
 

src/org/thoughtcrime/securesms/video/VideoPlayer.java

@@ -180,7 +180,7 @@ public class VideoPlayer extends FrameLayout {
     videoView.setMediaController(mediaController);
   }
 
-  private class ExoPlayerListener implements ExoPlayer.EventListener {
+  private static class ExoPlayerListener implements ExoPlayer.EventListener {
     private final Window window;
 
     ExoPlayerListener(Window window) {